lan78xx: use default alignment for rx buffers

The lan78xx uses a 12-byte hardware rx header, so there is no need
to allocate SKBs with NET_IP_ALIGN set. Removes alignment faults
in both dwc_otg and in ipv6 processing.

drivers/net/usb/lan78xx.c

@@ -3249,7 +3249,7 @@ static int rx_submit(struct lan78xx_net *dev, struct urb *urb, gfp_t flags)
 	size_t size = dev->rx_urb_size;
 	int ret = 0;
 
-	skb = netdev_alloc_skb_ip_align(dev->net, size);
+	skb = netdev_alloc_skb(dev->net, size);
 	if (!skb) {
 		usb_free_urb(urb);
 		return -ENOMEM;